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We report the XMM-Newton observation of a large X-ray flare from the HerbigAe star V892 Tau. The apparent low mass companion of V892 Tau, V892 Tau NE, isunresolved by XMM-Newton. Nevertheless there is compelling evidence fromcombined XMM-Newton and Chandra data that the origin of the flare is the HerbigAe star V892 Tau. During the flare the X-ray luminosity of V892 Tau increasesby a factor of ~15, while the temperature of the plasma increases from kT ~ 1.5keV to kT ~ 8 keV. From the scaling of the flare event, based on hydrodynamicmodeling, we conclude that a 500 G magnetic field is needed in order to confinethe plasma. Under the assumptions that a dynamo mechanism is required togenerate such a confining magnetic field and that surface convection is anecessary ingredient for a dynamo, our findings provide indirect evidence forthe existence of a significant convection zone in the stellar envelope ofHerbig Ae stars.Comment: accepted for publication in A&A (12 pages - 6 figures

A large X-ray flare from the Herbig Ae star V892 Tau